Aggregate Demand II: Applying the IS- LM Model
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1 12 : Applying the IS- LM Model Inflation CHAPTER 5 Modified by Ming i 2016 Worth Publishers, all rights reserved 11
2 Context Chapter 10 introduced the model of aggregate demand and supply. Chapter 11 developed the IS-LM model, the basis of the aggregate demand curve. 1
3 IN THIS CHAPTER, OU WILL LEARN: how to use the IS-LM model to analyze the effects of shocks, fiscal policy, and monetary policy how to derive the aggregate demand curve from the IS-LM model several theories about what caused the Great Depression 2
4 Equilibrium in the IS-LM model The IS curve represents equilibrium in the goods market. = C( T ) + I ( r) + G r LM The LM curve represents money market equilibrium. M P = L( r, ) The intersection determines the unique combination of and r that satisfies equilibrium in both markets. r 1 1 IS 3
5 Policy analysis with the IS-LM model = C( T ) + I ( r) + G M P = L( r, ) r LM We can use the IS-LM model to analyze the effects of r 1 fiscal policy: G and/or T monetary policy: M 1 IS 4
6 An increase in government purchases 1. IS curve shifts right 1 by ΔG 1 MPC causing output & income to rise. 2. This raises money demand, causing the interest rate to rise 3. which reduces investment, 1 so the final increase in 3. 1 is smaller than ΔG 1 MPC 2. r 2 r 1 r 1. 2 LM IS 2 IS 1 5
7 A tax cut Consumers save (1 MPC) of the tax cut, so the initial boost in spending is smaller for ΔT than for an equal ΔG and the IS curve shifts by MPC 1 MPC ΔT 2. so the effects on r and are smaller for ΔT than for an equal ΔG. r 2 r 1 r LM IS 2 IS 1 6
8 Monetary policy: An increase in M 1. ΔM > 0 shifts the LM curve down (or to the right) 2. causing the interest rate to fall r 1 r 2 r LM 1 LM 2 3. which increases investment, causing output & income to rise. 1 2 IS 7
9 Interaction between monetary & fiscal policy Model: Monetary & fiscal policy variables (M, G, and T ) are exogenous. Real world: Monetary policymakers may adjust M in response to changes in fiscal policy, or vice versa. Such interactions may alter the impact of the original policy change. 8
10 The Fed s response to ΔG > 0 Suppose Congress increases G. Possible Fed responses: 1. hold M constant 2. hold r constant 3. hold constant In each case, the effects of the ΔG are different 9
11 Response 1: Hold M constant If Congress raises G, the IS curve shifts right. r LM 1 If Fed holds M constant, then LM curve doesn t shift. r 2 r 1 Results: Δ = 2 1 Δ r = r r IS 1 IS 2 10
12 Response 2: Hold r constant If Congress raises G, the IS curve shifts right. To keep r constant, Fed increases M to shift LM curve right. r r 2 r 1 LM 1 LM 2 Results: Δ = IS 1 IS 2 Δ r = 0 11
13 Response 3: Hold constant If Congress raises G, the IS curve shifts right. r LM 2 LM 1 To keep constant, Fed reduces M to shift LM curve left. r 3 r 2 r 1 Results: Δ = 0 Δ r = r r IS 1 IS 2 12
14 Shocks in the IS-LM model IS shocks: exogenous changes in the demand for goods & services. Examples: stock market boom or crash g change in households wealth g ΔC change in business or consumer confidence or expectations g ΔI and/or ΔC 13
15 Shocks in the IS-LM model LM shocks: exogenous changes in the demand for money. Examples: A wave of credit card fraud increases demand for money. More ATMs or the Internet reduce money demand. 14
16 NOW OU TR Analyze shocks with the IS-LM model Use the IS-LM model to analyze the effects of 1. a housing market crash that reduces consumers wealth 2. consumers using cash in transactions more frequently in response to an increase in identity theft For each shock, a. use the IS-LM diagram to determine the effects on and r. b. figure out what happens to C, I, and the unemployment rate. 15
17 ANSWERS, PART 1 Housing market crash IS shifts left, causing r and to fall. r LM 1 C falls due to lower wealth and lower income, I rises because r is lower u rises because is lower (Okun s law) r 1 r IS 2 IS 1 16
18 ANSWERS, PART 2 Increase in money demand LM shifts left, causing r to rise and to fall. r LM 2 LM 1 C falls due to lower income, I falls because r is higher u rises because is lower (Okun s law) r 2 r IS 1 17
19 CASE STUD: The U.S. recession of 2001 During 2001: 2.1 million jobs lost, unemployment rose from 3.9% to 5.8%. GDP growth slowed to 0.8% (compared to 3.9% average annual growth during ). 18
20 CASE STUD: The U.S. recession of 2001 Causes: 1) Stock market decline g ic Index (1942 = 100) 1,500 1, Standard & Poor s
21 CASE STUD: The U.S. recession of 2001 Causes: 2) 9/11 increased uncertainty fall in consumer & business confidence result: lower spending, IS curve shifted left Causes: 3) Corporate accounting scandals Enron, WorldCom, etc. reduced stock prices, discouraged investment 20
22 CASE STUD: The U.S. recession of 2001 Fiscal policy response: shifted IS curve right tax cuts in 2001 and 2003 spending increases airline industry bailout NC reconstruction Afghanistan war 21
23 CASE STUD: The U.S. recession of 2001 Monetary policy response: shifted LM curve right Three-month T-Bill rate 22
24 What is the Fed s policy instrument? The news media commonly report the Fed s policy changes as interest rate changes, as if the Fed has direct control over market interest rates. In fact, the Fed targets the federal funds rate the interest rate banks charge one another on overnight loans. The Fed changes the money supply and shifts the LM curve to achieve its target. Other short-term rates typically move with the federal funds rate. 23
25 What is the Fed s policy instrument? Why does the Fed target interest rates instead of the money supply? 1) They are easier to measure than the money supply. 2) The Fed might believe that LM shocks are more prevalent than IS shocks. If so, then targeting the interest rate stabilizes income better than targeting the money supply. (See problem 8 on p.364.) 24
26 IS-LM and aggregate demand So far, we ve been using the IS-LM model to analyze the short run, when the price level is assumed fixed. However, a change in P would shift LM and therefore affect. The aggregate demand curve (introduced in Chap. 10) captures this relationship between P and. 25
27 Deriving the AD curve Intuition for slope of AD curve: r r 2 LM(P 2 ) LM(P 1 ) hp g i(m/p ) g LM shifts left g hr r 1 P 2 1 IS g ii P 2 g i P 1 AD
28 Monetary policy and the AD curve The Fed can increase aggregate demand: r r 1 LM(M 1 /P 1 ) LM(M 2 /P 1 ) hm g LM shifts right g ir g hi r 2 P 1 2 IS g h at each value of P P 1 AD AD 1 27
29 Fiscal policy and the AD curve Expansionary fiscal policy (hg and/or it) increases agg. demand: r r 2 r 1 LM IS 2 it g hc g IS shifts right P 1 2 IS 1 g h at each value of P P 1 AD AD 1 28
30 IS-LM and AD-AS in the short run & long run Recall from Chapter 10: The force that moves the economy from the short run to the long run is the gradual adjustment of prices. In the short-run equilibrium, if > < = then over time, the price level will rise fall remain constant 29
31 The SR and LR effects of an IS shock A negative IS shock shifts IS and AD left, causing to fall. r LRAS LM(P 1 ) IS 1 IS 2 P LRAS P 1 SRAS 1 AD 1 AD 2 30
32 The SR and LR effects of an IS shock r LRAS LM(P 1 ) In the new short-run equilibrium, < IS 1 IS 2 P LRAS P 1 SRAS 1 AD 1 AD 2 31
33 The SR and LR effects of an IS shock r LRAS LM(P 1 ) In the new short-run equilibrium, < IS 1 IS 2 Over time, P gradually falls, causing: SRAS to move down M/P to increase, which causes LM to move down P P 1 LRAS SRAS 1 AD 1 AD 2 32
34 The SR and LR effects of an IS shock r LRAS LM(P 1 ) LM(P 2 ) IS 1 IS 2 Over time, P gradually falls, causing: SRAS to move down M/P to increase, which causes LM to move down P P 1 P 2 LRAS SRAS 1 SRAS 2 AD 1 AD 2 33
35 The SR and LR effects of an IS shock r LRAS LM(P 1 ) LM(P 2 ) This process continues until economy reaches a long-run equilibrium with = P LRAS IS 2 IS 1 P 1 SRAS 1 P 2 SRAS 2 AD 1 AD 2 34
36 NOW OU TR Analyze SR & LR effects of ΔM a. Draw the IS-LM and AD-AS diagrams as shown here. r LRAS LM(M 1 /P 1 ) b. Suppose Fed increases M. Show the short-run effects on your graphs. IS c. Show what happens in the transition from the short run to the long run. P LRAS d. How do the new long-run equilibrium values of the endogenous variables compare to their initial values? P 1 SRAS 1 AD 1 35
37 ANSWERS, PART 1 Short-run effects of ΔM LM and AD shift right. r falls, rises above r r 1 r 2 LRAS LM(M 1 /P 1 ) LM(M 2 /P 1 ) IS P LRAS 2 P 1 SRAS AD 2 2 AD 1 36
38 ANSWERS, PART 2 Transition from short run to long run Over time, P rises SRAS moves upward M/P falls LM moves leftward New long-run eq m P higher all real variables back at their initial values r 3 = Money is neutral in the long run. r LRAS LM(M 12 /P 13 ) r LM(M 2 /P 1 ) 1 r 2 P P 3 P 1 LRAS 2 2 IS AD 2 AD 1 SRAS SRAS 37
39 The Great Depression billions of 1958 dollars Unemployment (right scale) 140 Real GNP (left scale) percent of labor force
40 THE SPENDING HPOTHESIS: Shocks to the IS curve Asserts the Depression was largely due to an exogenous fall in the demand for goods & services a leftward shift of the IS curve. Evidence: output and interest rates both fell, which is what a leftward IS shift would cause. 39
41 THE SPENDING HPOTHESIS: Reasons for the IS shift Stock market crash reduced consumption Oct 1929 Dec 1929: S&P 500 fell 17% Oct 1929 Dec 1933: S&P 500 fell 71% Drop in investment Correction after overbuilding in the 1920s. Widespread bank failures made it harder to obtain financing for investment. Contractionary fiscal policy Politicians raised tax rates and cut spending to combat rising deficits. 40
42 THE MONE HPOTHESIS: A shock to the LM curve Asserts that the Depression was largely due to huge fall in the money supply. Evidence: M1 fell 25% during But, two problems with this hypothesis: P fell even more, so M/P actually rose slightly during nominal interest rates fell, which is the opposite of what a leftward LM shift would cause. 41
43 THE MONE HPOTHESIS AGAIN: The effects of falling prices Asserts that the severity of the Depression was due to a huge deflation: P fell 25% during This deflation was probably caused by the fall in M, so perhaps money played an important role after all. In what ways does a deflation affect the economy? 42
44 THE MONE HPOTHESIS AGAIN: The effects of falling prices The stabilizing effects of deflation: ip g h(m/p) g LM shifts right g h Pigou effect: ip g h(m/p ) g consumers wealth h g hc g IS shifts right g h 43
45 THE MONE HPOTHESIS AGAIN: The effects of falling prices The destabilizing effects of expected deflation: ieπ g r h for each value of i g I i because I = I (r) g planned expenditure & agg. demand i g income & output i 44
46 THE MONE HPOTHESIS AGAIN: The effects of falling prices The destabilizing effects of unexpected deflation: debt-deflation theory ip (if unexpected) g transfers purchasing power from borrowers to lenders g borrowers are now less wealthy, lenders are now more wealthy g if borrowers propensity to spend is larger than lenders, then aggregate spending falls, the IS curve shifts left, and falls 45
47 Why another Depression is unlikely Policymakers (or their advisers) now know much more about macroeconomics: The Fed knows better than to let M fall so much, especially during a contraction. Fiscal policymakers know better than to raise taxes or cut spending during a contraction. Federal deposit insurance makes widespread bank failures very unlikely. Automatic stabilizers make fiscal policy expansionary during an economic downturn. 46
48 CASE STUD The financial crisis & recession 2009: Real GDP fell, u-rate approached 10% Important factors in the crisis: early 2000s Federal Reserve interest rate policy subprime mortgage crisis bursting of house price bubble, rising foreclosure rates falling stock prices failing financial institutions declining consumer confidence, drop in spending on consumer durables and investment goods 47
49 Interest rates and house prices interest rate (%) Federal Funds rate 30-year mortgage rate Case-Shiller 20-city composite house price index House price index, 2000 =
50 Change in U.S. house price index and rate of new foreclosures, Percent change in house prices (from 4 quarters earlier) 14% 12% 10% 8% 6% 4% 2% 0% -2% -4% US house price index New foreclosures New foreclosure starts (% of total mortgages) -6%
51 House price change and new foreclosures, 2006:Q3 2009:Q1 New foreclosures, % of all mortgages 20% 18% 16% 14% 12% 10% 8% 6% 4% 2% Nevada California Florida Arizona Rhode Island New Jersey Michigan Hawaii Illinois Wisconsin Oregon Ohio Alaska 0% -40% -30% -20% -10% 0% 10% 20% Cumulative change in house price index Georgia Colorado Texas S. Dakota Wyoming
52 U.S. bank failures by year, Number of bank failures
53 Major U.S. stock indexes (% change from 52 weeks earlier) 140% 120% 100% DJIA S&P 500 NASDAQ 80% 60% 40% 20% 0% -20% -40% -60% -80% 12/6/1999 8/13/2000 4/21/ /28/2001 9/5/2002 5/14/2003 1/20/2004 9/27/2004 6/5/2005 2/11/ /20/2006 6/28/2007 3/5/ /11/2008 7/20/2009
54 Consumer sentiment and growth in consumer durables and investment spending 20% % change from four quarters earlier 15% 10% 5% 0% -5% -10% -15% Durables -20% Investment UM Consumer Sentiment Index -25% Consumer Sentiment Index, 1966 = 100
55 Real GDP growth and unemployment % change from 4 quarters earlier Real GDP growth rate (left scale) Unemployment rate (right scale) % of labor force
56 1. IS-LM model CHAPTER SUMMAR a theory of aggregate demand exogenous: M, G, T, P exogenous in short run, in long run endogenous: r, endogenous in short run, P in long run IS curve: goods market equilibrium LM curve: money market equilibrium 55
57 2. AD curve CHAPTER SUMMAR shows relation between P and the IS-LM model s equilibrium. negative slope because hp g i(m/p) g hr g ii g i expansionary fiscal policy shifts IS curve right, raises income, and shifts AD curve right. expansionary monetary policy shifts LM curve right, raises income, and shifts AD curve right. IS or LM shocks shift the AD curve. 56
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